Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1991-03-25
1993-10-26
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
323222, 323282, 323351, H02M 3155
Patent
active
052571700
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to electric current converter topologies comprising several induction coils.
BACKGROUND OF THE INVENTION
An electric current converter is a device which is used to control the electric current flowing between a current source and a load. A conventional electric converter topology basically comprises an electric switching device and a magnetic coupling means. In a known topology the switching device consists for instance of a MOSFET transistor and a diode, and the magnetic coupling means consists of an induction coil which is sometimes associated with an input or output electric filter.
In such a topology the transistor is controlled at a high switching frequency (e.g. 50 kHz) so as to be conducting in saturation for a determined fraction of a time period. The diode is conducting only during the time that the transistor is not conducting. The magnetic coupling means are sized so as to assure limited voltage and current ripple capability.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a family of converter topologies which offers a wide variety of topologies from which to select the optimum topology to suit any particular application.
The electric converters according to the invention comprise at least three reactive elements connected in series, and a switching device comprising a switching transistor operating at a high frequency so that it becomes conducting for a fraction of each period of said frequency. The transistor and the diode are connected to the connection points between the reactive elements so that the diode is conducting only when the transistor is non-conducting and so that it is non-conducting each time the transistor becomes conducting.
Other features of the invention will be apparent from the detailed description hereinafter, in which the invention is disclosed in detail with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of a buck converter with non-inverted voltage and continuous input and output currents, wherein the three reactive elements are connected in series between an input terminal and an output terminal;
FIG. 2 is a schematic diagram of a buck converter with non-inverted voltage, wherein the three reactive elements are connected in series between an input terminal and a common terminal;
FIG. 3 is a schematic diagram of a non-inverted boost converter with continuous input and output currents, wherein the three reactive elements are connected in series between an input terminal and an output terminal;
FIG. 4 is a schematic diagram of a non-inverted boost converter with continuous input and output currents, wherein the three reactive elements are connected in series between a common terminal and an output terminal;
FIG. 5 is a schematic diagram of a non-inverted buck/boost converter with continuous input and output currents, wherein the three reactive elements are connected in series between an input terminal and a common terminal;
FIG. 6 is a schematic diagram of a non-inverted buck/boost converter with continuous input and output currents, wherein the three reactive elements are connected in series between an output terminal and a common terminal;
FIG. 7 is a modification of FIG. 5 wherein the two induction coils are replaced by two transformers;
FIG. 8 is a modification of FIG. 6 wherein the two induction coils are replaced by two transformers;
FIG. 9 is a schematic diagram of an inverted buck/boost converter with continuous input and output currents, wherein the three reactive elements are connected in series between an input terminal and an output terminal;
FIG. 10 is a schematic diagram of an inverted buck/boost converter, wherein the three reactive elements are connected in series between an input terminal and an output terminal;
FIG. 11 is a schematic diagram of an inverted buck/boost converter, wherein the three reactive elements are connected in series between an input terminal and an output terminal;
FIG. 12 is a schematic diag
REFERENCES:
patent: 4184197 (1980-01-01), Cuk et al.
patent: 4262328 (1981-04-01), Bloom et al.
patent: 4274133 (1981-06-01), Cuk et al.
patent: 4720668 (1988-01-01), Lee et al.
patent: 4961128 (1990-10-01), Bloom
Patent Abstracts of Japan, vol. 6, No. 67 (E-104) (945), Apr. 28, 1982.
Agence Spatiale Europeenne
Beha Jr. William H.
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